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Default Always problems identifying smd diodes

Hallo
i have a dreambox 7020 who does not supplies the lnb.
No voltages, no 13 and no 17 volts.
I suspect a SMD diode marked:
in the first line:
R13
in the second line there is a symbol (i think it is the F of fairchild)
and then P731.
I think them are shottky but can you give me any suggestions?
Thank you in advance
Slang
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